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[thirdparty/git.git] / compat / mingw.c
1 #include "../git-compat-util.h"
2 #include "win32.h"
3 #include <conio.h>
4 #include <wchar.h>
5 #include "../strbuf.h"
6 #include "../run-command.h"
7 #include "../cache.h"
8 #include "win32/lazyload.h"
9 #include "../config.h"
10 #include "dir.h"
11
12 #define HCAST(type, handle) ((type)(intptr_t)handle)
13
14 static const int delay[] = { 0, 1, 10, 20, 40 };
15
16 void open_in_gdb(void)
17 {
18 static struct child_process cp = CHILD_PROCESS_INIT;
19 extern char *_pgmptr;
20
21 argv_array_pushl(&cp.args, "mintty", "gdb", NULL);
22 argv_array_pushf(&cp.args, "--pid=%d", getpid());
23 cp.clean_on_exit = 1;
24 if (start_command(&cp) < 0)
25 die_errno("Could not start gdb");
26 sleep(1);
27 }
28
29 int err_win_to_posix(DWORD winerr)
30 {
31 int error = ENOSYS;
32 switch(winerr) {
33 case ERROR_ACCESS_DENIED: error = EACCES; break;
34 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
35 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
36 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
37 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
38 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
39 case ERROR_BAD_COMMAND: error = EIO; break;
40 case ERROR_BAD_DEVICE: error = ENODEV; break;
41 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
42 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
43 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
44 case ERROR_BAD_LENGTH: error = EINVAL; break;
45 case ERROR_BAD_PATHNAME: error = ENOENT; break;
46 case ERROR_BAD_PIPE: error = EPIPE; break;
47 case ERROR_BAD_UNIT: error = ENODEV; break;
48 case ERROR_BAD_USERNAME: error = EINVAL; break;
49 case ERROR_BROKEN_PIPE: error = EPIPE; break;
50 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
51 case ERROR_BUSY: error = EBUSY; break;
52 case ERROR_BUSY_DRIVE: error = EBUSY; break;
53 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
54 case ERROR_CANNOT_MAKE: error = EACCES; break;
55 case ERROR_CANTOPEN: error = EIO; break;
56 case ERROR_CANTREAD: error = EIO; break;
57 case ERROR_CANTWRITE: error = EIO; break;
58 case ERROR_CRC: error = EIO; break;
59 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
60 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
61 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
62 case ERROR_DIRECTORY: error = EINVAL; break;
63 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
64 case ERROR_DISK_CHANGE: error = EIO; break;
65 case ERROR_DISK_FULL: error = ENOSPC; break;
66 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
67 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
68 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
69 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
70 case ERROR_FILE_EXISTS: error = EEXIST; break;
71 case ERROR_FILE_INVALID: error = ENODEV; break;
72 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
73 case ERROR_GEN_FAILURE: error = EIO; break;
74 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
75 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
76 case ERROR_INVALID_ACCESS: error = EACCES; break;
77 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
78 case ERROR_INVALID_BLOCK: error = EFAULT; break;
79 case ERROR_INVALID_DATA: error = EINVAL; break;
80 case ERROR_INVALID_DRIVE: error = ENODEV; break;
81 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
82 case ERROR_INVALID_FLAGS: error = EINVAL; break;
83 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
84 case ERROR_INVALID_HANDLE: error = EBADF; break;
85 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
86 case ERROR_INVALID_NAME: error = EINVAL; break;
87 case ERROR_INVALID_OWNER: error = EINVAL; break;
88 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
89 case ERROR_INVALID_PASSWORD: error = EPERM; break;
90 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
91 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
92 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
93 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
94 case ERROR_IO_DEVICE: error = EIO; break;
95 case ERROR_IO_INCOMPLETE: error = EINTR; break;
96 case ERROR_LOCKED: error = EBUSY; break;
97 case ERROR_LOCK_VIOLATION: error = EACCES; break;
98 case ERROR_LOGON_FAILURE: error = EACCES; break;
99 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
100 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
101 case ERROR_MORE_DATA: error = EPIPE; break;
102 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
103 case ERROR_NOACCESS: error = EFAULT; break;
104 case ERROR_NONE_MAPPED: error = EINVAL; break;
105 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
106 case ERROR_NOT_READY: error = EAGAIN; break;
107 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
108 case ERROR_NO_DATA: error = EPIPE; break;
109 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
110 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
111 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
112 case ERROR_OPEN_FAILED: error = EIO; break;
113 case ERROR_OPEN_FILES: error = EBUSY; break;
114 case ERROR_OPERATION_ABORTED: error = EINTR; break;
115 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
116 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
117 case ERROR_PATH_BUSY: error = EBUSY; break;
118 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
119 case ERROR_PIPE_BUSY: error = EBUSY; break;
120 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
121 case ERROR_PIPE_LISTENING: error = EPIPE; break;
122 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
123 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
124 case ERROR_READ_FAULT: error = EIO; break;
125 case ERROR_SEEK: error = EIO; break;
126 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
127 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
128 case ERROR_SHARING_VIOLATION: error = EACCES; break;
129 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
130 case ERROR_SUCCESS: BUG("err_win_to_posix() called without an error!");
131 case ERROR_SWAPERROR: error = ENOENT; break;
132 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
133 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
134 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
135 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
136 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
137 case ERROR_WRITE_FAULT: error = EIO; break;
138 case ERROR_WRITE_PROTECT: error = EROFS; break;
139 }
140 return error;
141 }
142
143 static inline int is_file_in_use_error(DWORD errcode)
144 {
145 switch (errcode) {
146 case ERROR_SHARING_VIOLATION:
147 case ERROR_ACCESS_DENIED:
148 return 1;
149 }
150
151 return 0;
152 }
153
154 static int read_yes_no_answer(void)
155 {
156 char answer[1024];
157
158 if (fgets(answer, sizeof(answer), stdin)) {
159 size_t answer_len = strlen(answer);
160 int got_full_line = 0, c;
161
162 /* remove the newline */
163 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
164 answer[answer_len-2] = '\0';
165 got_full_line = 1;
166 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
167 answer[answer_len-1] = '\0';
168 got_full_line = 1;
169 }
170 /* flush the buffer in case we did not get the full line */
171 if (!got_full_line)
172 while ((c = getchar()) != EOF && c != '\n')
173 ;
174 } else
175 /* we could not read, return the
176 * default answer which is no */
177 return 0;
178
179 if (tolower(answer[0]) == 'y' && !answer[1])
180 return 1;
181 if (!strncasecmp(answer, "yes", sizeof(answer)))
182 return 1;
183 if (tolower(answer[0]) == 'n' && !answer[1])
184 return 0;
185 if (!strncasecmp(answer, "no", sizeof(answer)))
186 return 0;
187
188 /* did not find an answer we understand */
189 return -1;
190 }
191
192 static int ask_yes_no_if_possible(const char *format, ...)
193 {
194 char question[4096];
195 const char *retry_hook[] = { NULL, NULL, NULL };
196 va_list args;
197
198 va_start(args, format);
199 vsnprintf(question, sizeof(question), format, args);
200 va_end(args);
201
202 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
203 retry_hook[1] = question;
204 return !run_command_v_opt(retry_hook, 0);
205 }
206
207 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
208 return 0;
209
210 while (1) {
211 int answer;
212 fprintf(stderr, "%s (y/n) ", question);
213
214 if ((answer = read_yes_no_answer()) >= 0)
215 return answer;
216
217 fprintf(stderr, "Sorry, I did not understand your answer. "
218 "Please type 'y' or 'n'\n");
219 }
220 }
221
222 /* Windows only */
223 enum hide_dotfiles_type {
224 HIDE_DOTFILES_FALSE = 0,
225 HIDE_DOTFILES_TRUE,
226 HIDE_DOTFILES_DOTGITONLY
227 };
228
229 static int core_restrict_inherited_handles = -1;
230 static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
231 static char *unset_environment_variables;
232
233 int mingw_core_config(const char *var, const char *value, void *cb)
234 {
235 if (!strcmp(var, "core.hidedotfiles")) {
236 if (value && !strcasecmp(value, "dotgitonly"))
237 hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
238 else
239 hide_dotfiles = git_config_bool(var, value);
240 return 0;
241 }
242
243 if (!strcmp(var, "core.unsetenvvars")) {
244 free(unset_environment_variables);
245 unset_environment_variables = xstrdup(value);
246 return 0;
247 }
248
249 if (!strcmp(var, "core.restrictinheritedhandles")) {
250 if (value && !strcasecmp(value, "auto"))
251 core_restrict_inherited_handles = -1;
252 else
253 core_restrict_inherited_handles =
254 git_config_bool(var, value);
255 return 0;
256 }
257
258 return 0;
259 }
260
261 /* Normalizes NT paths as returned by some low-level APIs. */
262 static wchar_t *normalize_ntpath(wchar_t *wbuf)
263 {
264 int i;
265 /* fix absolute path prefixes */
266 if (wbuf[0] == '\\') {
267 /* strip NT namespace prefixes */
268 if (!wcsncmp(wbuf, L"\\??\\", 4) ||
269 !wcsncmp(wbuf, L"\\\\?\\", 4))
270 wbuf += 4;
271 else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
272 wbuf += 12;
273 /* replace remaining '...UNC\' with '\\' */
274 if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
275 wbuf += 2;
276 *wbuf = '\\';
277 }
278 }
279 /* convert backslashes to slashes */
280 for (i = 0; wbuf[i]; i++)
281 if (wbuf[i] == '\\')
282 wbuf[i] = '/';
283 return wbuf;
284 }
285
286 int mingw_unlink(const char *pathname)
287 {
288 int ret, tries = 0;
289 wchar_t wpathname[MAX_PATH];
290 if (xutftowcs_path(wpathname, pathname) < 0)
291 return -1;
292
293 /* read-only files cannot be removed */
294 _wchmod(wpathname, 0666);
295 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
296 if (!is_file_in_use_error(GetLastError()))
297 break;
298 /*
299 * We assume that some other process had the source or
300 * destination file open at the wrong moment and retry.
301 * In order to give the other process a higher chance to
302 * complete its operation, we give up our time slice now.
303 * If we have to retry again, we do sleep a bit.
304 */
305 Sleep(delay[tries]);
306 tries++;
307 }
308 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
309 ask_yes_no_if_possible("Unlink of file '%s' failed. "
310 "Should I try again?", pathname))
311 ret = _wunlink(wpathname);
312 return ret;
313 }
314
315 static int is_dir_empty(const wchar_t *wpath)
316 {
317 WIN32_FIND_DATAW findbuf;
318 HANDLE handle;
319 wchar_t wbuf[MAX_PATH + 2];
320 wcscpy(wbuf, wpath);
321 wcscat(wbuf, L"\\*");
322 handle = FindFirstFileW(wbuf, &findbuf);
323 if (handle == INVALID_HANDLE_VALUE)
324 return GetLastError() == ERROR_NO_MORE_FILES;
325
326 while (!wcscmp(findbuf.cFileName, L".") ||
327 !wcscmp(findbuf.cFileName, L".."))
328 if (!FindNextFileW(handle, &findbuf)) {
329 DWORD err = GetLastError();
330 FindClose(handle);
331 return err == ERROR_NO_MORE_FILES;
332 }
333 FindClose(handle);
334 return 0;
335 }
336
337 int mingw_rmdir(const char *pathname)
338 {
339 int ret, tries = 0;
340 wchar_t wpathname[MAX_PATH];
341 if (xutftowcs_path(wpathname, pathname) < 0)
342 return -1;
343
344 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
345 if (!is_file_in_use_error(GetLastError()))
346 errno = err_win_to_posix(GetLastError());
347 if (errno != EACCES)
348 break;
349 if (!is_dir_empty(wpathname)) {
350 errno = ENOTEMPTY;
351 break;
352 }
353 /*
354 * We assume that some other process had the source or
355 * destination file open at the wrong moment and retry.
356 * In order to give the other process a higher chance to
357 * complete its operation, we give up our time slice now.
358 * If we have to retry again, we do sleep a bit.
359 */
360 Sleep(delay[tries]);
361 tries++;
362 }
363 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
364 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
365 "Should I try again?", pathname))
366 ret = _wrmdir(wpathname);
367 if (!ret)
368 invalidate_lstat_cache();
369 return ret;
370 }
371
372 static inline int needs_hiding(const char *path)
373 {
374 const char *basename;
375
376 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
377 return 0;
378
379 /* We cannot use basename(), as it would remove trailing slashes */
380 win32_skip_dos_drive_prefix((char **)&path);
381 if (!*path)
382 return 0;
383
384 for (basename = path; *path; path++)
385 if (is_dir_sep(*path)) {
386 do {
387 path++;
388 } while (is_dir_sep(*path));
389 /* ignore trailing slashes */
390 if (*path)
391 basename = path;
392 else
393 break;
394 }
395
396 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
397 return *basename == '.';
398
399 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
400 return !strncasecmp(".git", basename, 4) &&
401 (!basename[4] || is_dir_sep(basename[4]));
402 }
403
404 static int set_hidden_flag(const wchar_t *path, int set)
405 {
406 DWORD original = GetFileAttributesW(path), modified;
407 if (set)
408 modified = original | FILE_ATTRIBUTE_HIDDEN;
409 else
410 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
411 if (original == modified || SetFileAttributesW(path, modified))
412 return 0;
413 errno = err_win_to_posix(GetLastError());
414 return -1;
415 }
416
417 int mingw_mkdir(const char *path, int mode)
418 {
419 int ret;
420 wchar_t wpath[MAX_PATH];
421
422 if (!is_valid_win32_path(path, 0)) {
423 errno = EINVAL;
424 return -1;
425 }
426
427 if (xutftowcs_path(wpath, path) < 0)
428 return -1;
429 ret = _wmkdir(wpath);
430 if (!ret && needs_hiding(path))
431 return set_hidden_flag(wpath, 1);
432 return ret;
433 }
434
435 /*
436 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
437 * is documented in [1] as opening a writable file handle in append mode.
438 * (It is believed that) this is atomic since it is maintained by the
439 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
440 *
441 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
442 *
443 * This trick does not appear to work for named pipes. Instead it creates
444 * a named pipe client handle that cannot be written to. Callers should
445 * just use the regular _wopen() for them. (And since client handle gets
446 * bound to a unique server handle, it isn't really an issue.)
447 */
448 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
449 {
450 HANDLE handle;
451 int fd;
452 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
453
454 /* only these flags are supported */
455 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
456 return errno = ENOSYS, -1;
457
458 /*
459 * FILE_SHARE_WRITE is required to permit child processes
460 * to append to the file.
461 */
462 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
463 FILE_SHARE_WRITE | FILE_SHARE_READ,
464 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
465 if (handle == INVALID_HANDLE_VALUE)
466 return errno = err_win_to_posix(GetLastError()), -1;
467
468 /*
469 * No O_APPEND here, because the CRT uses it only to reset the
470 * file pointer to EOF before each write(); but that is not
471 * necessary (and may lead to races) for a file created with
472 * FILE_APPEND_DATA.
473 */
474 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
475 if (fd < 0)
476 CloseHandle(handle);
477 return fd;
478 }
479
480 /*
481 * Does the pathname map to the local named pipe filesystem?
482 * That is, does it have a "//./pipe/" prefix?
483 */
484 static int is_local_named_pipe_path(const char *filename)
485 {
486 return (is_dir_sep(filename[0]) &&
487 is_dir_sep(filename[1]) &&
488 filename[2] == '.' &&
489 is_dir_sep(filename[3]) &&
490 !strncasecmp(filename+4, "pipe", 4) &&
491 is_dir_sep(filename[8]) &&
492 filename[9]);
493 }
494
495 int mingw_open (const char *filename, int oflags, ...)
496 {
497 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
498 va_list args;
499 unsigned mode;
500 int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
501 wchar_t wfilename[MAX_PATH];
502 open_fn_t open_fn;
503
504 va_start(args, oflags);
505 mode = va_arg(args, int);
506 va_end(args);
507
508 if (!is_valid_win32_path(filename, !create)) {
509 errno = create ? EINVAL : ENOENT;
510 return -1;
511 }
512
513 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
514 open_fn = mingw_open_append;
515 else
516 open_fn = _wopen;
517
518 if (filename && !strcmp(filename, "/dev/null"))
519 wcscpy(wfilename, L"nul");
520 else if (xutftowcs_path(wfilename, filename) < 0)
521 return -1;
522
523 fd = open_fn(wfilename, oflags, mode);
524
525 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
526 DWORD attrs = GetFileAttributesW(wfilename);
527 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
528 errno = EISDIR;
529 }
530 if ((oflags & O_CREAT) && needs_hiding(filename)) {
531 /*
532 * Internally, _wopen() uses the CreateFile() API which errors
533 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
534 * specified and an already existing file's attributes do not
535 * match *exactly*. As there is no mode or flag we can set that
536 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
537 * again *without* the O_CREAT flag (that corresponds to the
538 * CREATE_ALWAYS flag of CreateFile()).
539 */
540 if (fd < 0 && errno == EACCES)
541 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
542 if (fd >= 0 && set_hidden_flag(wfilename, 1))
543 warning("could not mark '%s' as hidden.", filename);
544 }
545 return fd;
546 }
547
548 static BOOL WINAPI ctrl_ignore(DWORD type)
549 {
550 return TRUE;
551 }
552
553 #undef fgetc
554 int mingw_fgetc(FILE *stream)
555 {
556 int ch;
557 if (!isatty(_fileno(stream)))
558 return fgetc(stream);
559
560 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
561 while (1) {
562 ch = fgetc(stream);
563 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
564 break;
565
566 /* Ctrl+C was pressed, simulate SIGINT and retry */
567 mingw_raise(SIGINT);
568 }
569 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
570 return ch;
571 }
572
573 #undef fopen
574 FILE *mingw_fopen (const char *filename, const char *otype)
575 {
576 int hide = needs_hiding(filename);
577 FILE *file;
578 wchar_t wfilename[MAX_PATH], wotype[4];
579 if (filename && !strcmp(filename, "/dev/null"))
580 wcscpy(wfilename, L"nul");
581 else if (!is_valid_win32_path(filename, 1)) {
582 int create = otype && strchr(otype, 'w');
583 errno = create ? EINVAL : ENOENT;
584 return NULL;
585 } else if (xutftowcs_path(wfilename, filename) < 0)
586 return NULL;
587
588 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
589 return NULL;
590
591 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
592 error("could not unhide %s", filename);
593 return NULL;
594 }
595 file = _wfopen(wfilename, wotype);
596 if (!file && GetLastError() == ERROR_INVALID_NAME)
597 errno = ENOENT;
598 if (file && hide && set_hidden_flag(wfilename, 1))
599 warning("could not mark '%s' as hidden.", filename);
600 return file;
601 }
602
603 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
604 {
605 int hide = needs_hiding(filename);
606 FILE *file;
607 wchar_t wfilename[MAX_PATH], wotype[4];
608 if (filename && !strcmp(filename, "/dev/null"))
609 wcscpy(wfilename, L"nul");
610 else if (!is_valid_win32_path(filename, 1)) {
611 int create = otype && strchr(otype, 'w');
612 errno = create ? EINVAL : ENOENT;
613 return NULL;
614 } else if (xutftowcs_path(wfilename, filename) < 0)
615 return NULL;
616
617 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
618 return NULL;
619
620 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
621 error("could not unhide %s", filename);
622 return NULL;
623 }
624 file = _wfreopen(wfilename, wotype, stream);
625 if (file && hide && set_hidden_flag(wfilename, 1))
626 warning("could not mark '%s' as hidden.", filename);
627 return file;
628 }
629
630 #undef fflush
631 int mingw_fflush(FILE *stream)
632 {
633 int ret = fflush(stream);
634
635 /*
636 * write() is used behind the scenes of stdio output functions.
637 * Since git code does not check for errors after each stdio write
638 * operation, it can happen that write() is called by a later
639 * stdio function even if an earlier write() call failed. In the
640 * case of a pipe whose readable end was closed, only the first
641 * call to write() reports EPIPE on Windows. Subsequent write()
642 * calls report EINVAL. It is impossible to notice whether this
643 * fflush invocation triggered such a case, therefore, we have to
644 * catch all EINVAL errors whole-sale.
645 */
646 if (ret && errno == EINVAL)
647 errno = EPIPE;
648
649 return ret;
650 }
651
652 #undef write
653 ssize_t mingw_write(int fd, const void *buf, size_t len)
654 {
655 ssize_t result = write(fd, buf, len);
656
657 if (result < 0 && errno == EINVAL && buf) {
658 /* check if fd is a pipe */
659 HANDLE h = (HANDLE) _get_osfhandle(fd);
660 if (GetFileType(h) == FILE_TYPE_PIPE)
661 errno = EPIPE;
662 else
663 errno = EINVAL;
664 }
665
666 return result;
667 }
668
669 int mingw_access(const char *filename, int mode)
670 {
671 wchar_t wfilename[MAX_PATH];
672 if (xutftowcs_path(wfilename, filename) < 0)
673 return -1;
674 /* X_OK is not supported by the MSVCRT version */
675 return _waccess(wfilename, mode & ~X_OK);
676 }
677
678 int mingw_chdir(const char *dirname)
679 {
680 wchar_t wdirname[MAX_PATH];
681 if (xutftowcs_path(wdirname, dirname) < 0)
682 return -1;
683 return _wchdir(wdirname);
684 }
685
686 int mingw_chmod(const char *filename, int mode)
687 {
688 wchar_t wfilename[MAX_PATH];
689 if (xutftowcs_path(wfilename, filename) < 0)
690 return -1;
691 return _wchmod(wfilename, mode);
692 }
693
694 /*
695 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
696 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
697 */
698 static inline long long filetime_to_hnsec(const FILETIME *ft)
699 {
700 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
701 /* Windows to Unix Epoch conversion */
702 return winTime - 116444736000000000LL;
703 }
704
705 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
706 {
707 long long hnsec = filetime_to_hnsec(ft);
708 ts->tv_sec = (time_t)(hnsec / 10000000);
709 ts->tv_nsec = (hnsec % 10000000) * 100;
710 }
711
712 /**
713 * Verifies that safe_create_leading_directories() would succeed.
714 */
715 static int has_valid_directory_prefix(wchar_t *wfilename)
716 {
717 int n = wcslen(wfilename);
718
719 while (n > 0) {
720 wchar_t c = wfilename[--n];
721 DWORD attributes;
722
723 if (!is_dir_sep(c))
724 continue;
725
726 wfilename[n] = L'\0';
727 attributes = GetFileAttributesW(wfilename);
728 wfilename[n] = c;
729 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
730 attributes == FILE_ATTRIBUTE_DEVICE)
731 return 1;
732 if (attributes == INVALID_FILE_ATTRIBUTES)
733 switch (GetLastError()) {
734 case ERROR_PATH_NOT_FOUND:
735 continue;
736 case ERROR_FILE_NOT_FOUND:
737 /* This implies parent directory exists. */
738 return 1;
739 }
740 return 0;
741 }
742 return 1;
743 }
744
745 /* We keep the do_lstat code in a separate function to avoid recursion.
746 * When a path ends with a slash, the stat will fail with ENOENT. In
747 * this case, we strip the trailing slashes and stat again.
748 *
749 * If follow is true then act like stat() and report on the link
750 * target. Otherwise report on the link itself.
751 */
752 static int do_lstat(int follow, const char *file_name, struct stat *buf)
753 {
754 WIN32_FILE_ATTRIBUTE_DATA fdata;
755 wchar_t wfilename[MAX_PATH];
756 if (xutftowcs_path(wfilename, file_name) < 0)
757 return -1;
758
759 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
760 buf->st_ino = 0;
761 buf->st_gid = 0;
762 buf->st_uid = 0;
763 buf->st_nlink = 1;
764 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
765 buf->st_size = fdata.nFileSizeLow |
766 (((off_t)fdata.nFileSizeHigh)<<32);
767 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
768 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
769 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
770 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
771 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
772 WIN32_FIND_DATAW findbuf;
773 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
774 if (handle != INVALID_HANDLE_VALUE) {
775 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
776 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
777 if (follow) {
778 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
779 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
780 } else {
781 buf->st_mode = S_IFLNK;
782 }
783 buf->st_mode |= S_IREAD;
784 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
785 buf->st_mode |= S_IWRITE;
786 }
787 FindClose(handle);
788 }
789 }
790 return 0;
791 }
792 switch (GetLastError()) {
793 case ERROR_ACCESS_DENIED:
794 case ERROR_SHARING_VIOLATION:
795 case ERROR_LOCK_VIOLATION:
796 case ERROR_SHARING_BUFFER_EXCEEDED:
797 errno = EACCES;
798 break;
799 case ERROR_BUFFER_OVERFLOW:
800 errno = ENAMETOOLONG;
801 break;
802 case ERROR_NOT_ENOUGH_MEMORY:
803 errno = ENOMEM;
804 break;
805 case ERROR_PATH_NOT_FOUND:
806 if (!has_valid_directory_prefix(wfilename)) {
807 errno = ENOTDIR;
808 break;
809 }
810 /* fallthru */
811 default:
812 errno = ENOENT;
813 break;
814 }
815 return -1;
816 }
817
818 /* We provide our own lstat/fstat functions, since the provided
819 * lstat/fstat functions are so slow. These stat functions are
820 * tailored for Git's usage (read: fast), and are not meant to be
821 * complete. Note that Git stat()s are redirected to mingw_lstat()
822 * too, since Windows doesn't really handle symlinks that well.
823 */
824 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
825 {
826 int namelen;
827 char alt_name[PATH_MAX];
828
829 if (!do_lstat(follow, file_name, buf))
830 return 0;
831
832 /* if file_name ended in a '/', Windows returned ENOENT;
833 * try again without trailing slashes
834 */
835 if (errno != ENOENT)
836 return -1;
837
838 namelen = strlen(file_name);
839 if (namelen && file_name[namelen-1] != '/')
840 return -1;
841 while (namelen && file_name[namelen-1] == '/')
842 --namelen;
843 if (!namelen || namelen >= PATH_MAX)
844 return -1;
845
846 memcpy(alt_name, file_name, namelen);
847 alt_name[namelen] = 0;
848 return do_lstat(follow, alt_name, buf);
849 }
850
851 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
852 {
853 BY_HANDLE_FILE_INFORMATION fdata;
854
855 if (!GetFileInformationByHandle(hnd, &fdata)) {
856 errno = err_win_to_posix(GetLastError());
857 return -1;
858 }
859
860 buf->st_ino = 0;
861 buf->st_gid = 0;
862 buf->st_uid = 0;
863 buf->st_nlink = 1;
864 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
865 buf->st_size = fdata.nFileSizeLow |
866 (((off_t)fdata.nFileSizeHigh)<<32);
867 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
868 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
869 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
870 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
871 return 0;
872 }
873
874 int mingw_lstat(const char *file_name, struct stat *buf)
875 {
876 return do_stat_internal(0, file_name, buf);
877 }
878 int mingw_stat(const char *file_name, struct stat *buf)
879 {
880 return do_stat_internal(1, file_name, buf);
881 }
882
883 int mingw_fstat(int fd, struct stat *buf)
884 {
885 HANDLE fh = (HANDLE)_get_osfhandle(fd);
886 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
887
888 switch (type) {
889 case FILE_TYPE_DISK:
890 return get_file_info_by_handle(fh, buf);
891
892 case FILE_TYPE_CHAR:
893 case FILE_TYPE_PIPE:
894 /* initialize stat fields */
895 memset(buf, 0, sizeof(*buf));
896 buf->st_nlink = 1;
897
898 if (type == FILE_TYPE_CHAR) {
899 buf->st_mode = _S_IFCHR;
900 } else {
901 buf->st_mode = _S_IFIFO;
902 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
903 buf->st_size = avail;
904 }
905 return 0;
906
907 default:
908 errno = EBADF;
909 return -1;
910 }
911 }
912
913 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
914 {
915 long long winTime = t * 10000000LL + 116444736000000000LL;
916 ft->dwLowDateTime = winTime;
917 ft->dwHighDateTime = winTime >> 32;
918 }
919
920 int mingw_utime (const char *file_name, const struct utimbuf *times)
921 {
922 FILETIME mft, aft;
923 int fh, rc;
924 DWORD attrs;
925 wchar_t wfilename[MAX_PATH];
926 if (xutftowcs_path(wfilename, file_name) < 0)
927 return -1;
928
929 /* must have write permission */
930 attrs = GetFileAttributesW(wfilename);
931 if (attrs != INVALID_FILE_ATTRIBUTES &&
932 (attrs & FILE_ATTRIBUTE_READONLY)) {
933 /* ignore errors here; open() will report them */
934 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
935 }
936
937 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
938 rc = -1;
939 goto revert_attrs;
940 }
941
942 if (times) {
943 time_t_to_filetime(times->modtime, &mft);
944 time_t_to_filetime(times->actime, &aft);
945 } else {
946 GetSystemTimeAsFileTime(&mft);
947 aft = mft;
948 }
949 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
950 errno = EINVAL;
951 rc = -1;
952 } else
953 rc = 0;
954 close(fh);
955
956 revert_attrs:
957 if (attrs != INVALID_FILE_ATTRIBUTES &&
958 (attrs & FILE_ATTRIBUTE_READONLY)) {
959 /* ignore errors again */
960 SetFileAttributesW(wfilename, attrs);
961 }
962 return rc;
963 }
964
965 #undef strftime
966 size_t mingw_strftime(char *s, size_t max,
967 const char *format, const struct tm *tm)
968 {
969 size_t ret = strftime(s, max, format, tm);
970
971 if (!ret && errno == EINVAL)
972 die("invalid strftime format: '%s'", format);
973 return ret;
974 }
975
976 unsigned int sleep (unsigned int seconds)
977 {
978 Sleep(seconds*1000);
979 return 0;
980 }
981
982 char *mingw_mktemp(char *template)
983 {
984 wchar_t wtemplate[MAX_PATH];
985 if (xutftowcs_path(wtemplate, template) < 0)
986 return NULL;
987 if (!_wmktemp(wtemplate))
988 return NULL;
989 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
990 return NULL;
991 return template;
992 }
993
994 int mkstemp(char *template)
995 {
996 char *filename = mktemp(template);
997 if (filename == NULL)
998 return -1;
999 return open(filename, O_RDWR | O_CREAT, 0600);
1000 }
1001
1002 int gettimeofday(struct timeval *tv, void *tz)
1003 {
1004 FILETIME ft;
1005 long long hnsec;
1006
1007 GetSystemTimeAsFileTime(&ft);
1008 hnsec = filetime_to_hnsec(&ft);
1009 tv->tv_sec = hnsec / 10000000;
1010 tv->tv_usec = (hnsec % 10000000) / 10;
1011 return 0;
1012 }
1013
1014 int pipe(int filedes[2])
1015 {
1016 HANDLE h[2];
1017
1018 /* this creates non-inheritable handles */
1019 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
1020 errno = err_win_to_posix(GetLastError());
1021 return -1;
1022 }
1023 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
1024 if (filedes[0] < 0) {
1025 CloseHandle(h[0]);
1026 CloseHandle(h[1]);
1027 return -1;
1028 }
1029 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
1030 if (filedes[1] < 0) {
1031 close(filedes[0]);
1032 CloseHandle(h[1]);
1033 return -1;
1034 }
1035 return 0;
1036 }
1037
1038 struct tm *gmtime_r(const time_t *timep, struct tm *result)
1039 {
1040 if (gmtime_s(result, timep) == 0)
1041 return result;
1042 return NULL;
1043 }
1044
1045 struct tm *localtime_r(const time_t *timep, struct tm *result)
1046 {
1047 if (localtime_s(result, timep) == 0)
1048 return result;
1049 return NULL;
1050 }
1051
1052 char *mingw_getcwd(char *pointer, int len)
1053 {
1054 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
1055 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
1056
1057 if (!ret || ret >= ARRAY_SIZE(cwd)) {
1058 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
1059 return NULL;
1060 }
1061 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
1062 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
1063 HANDLE hnd = CreateFileW(cwd, 0,
1064 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
1065 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
1066 if (hnd == INVALID_HANDLE_VALUE)
1067 return NULL;
1068 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
1069 CloseHandle(hnd);
1070 if (!ret || ret >= ARRAY_SIZE(wpointer))
1071 return NULL;
1072 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
1073 return NULL;
1074 return pointer;
1075 }
1076 if (!ret || ret >= ARRAY_SIZE(wpointer))
1077 return NULL;
1078 if (xwcstoutf(pointer, wpointer, len) < 0)
1079 return NULL;
1080 convert_slashes(pointer);
1081 return pointer;
1082 }
1083
1084 /*
1085 * See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
1086 * https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
1087 */
1088 static const char *quote_arg_msvc(const char *arg)
1089 {
1090 /* count chars to quote */
1091 int len = 0, n = 0;
1092 int force_quotes = 0;
1093 char *q, *d;
1094 const char *p = arg;
1095 if (!*p) force_quotes = 1;
1096 while (*p) {
1097 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1098 force_quotes = 1;
1099 else if (*p == '"')
1100 n++;
1101 else if (*p == '\\') {
1102 int count = 0;
1103 while (*p == '\\') {
1104 count++;
1105 p++;
1106 len++;
1107 }
1108 if (*p == '"' || !*p)
1109 n += count*2 + 1;
1110 continue;
1111 }
1112 len++;
1113 p++;
1114 }
1115 if (!force_quotes && n == 0)
1116 return arg;
1117
1118 /* insert \ where necessary */
1119 d = q = xmalloc(st_add3(len, n, 3));
1120 *d++ = '"';
1121 while (*arg) {
1122 if (*arg == '"')
1123 *d++ = '\\';
1124 else if (*arg == '\\') {
1125 int count = 0;
1126 while (*arg == '\\') {
1127 count++;
1128 *d++ = *arg++;
1129 }
1130 if (*arg == '"' || !*arg) {
1131 while (count-- > 0)
1132 *d++ = '\\';
1133 /* don't escape the surrounding end quote */
1134 if (!*arg)
1135 break;
1136 *d++ = '\\';
1137 }
1138 }
1139 *d++ = *arg++;
1140 }
1141 *d++ = '"';
1142 *d++ = '\0';
1143 return q;
1144 }
1145
1146 #include "quote.h"
1147
1148 static const char *quote_arg_msys2(const char *arg)
1149 {
1150 struct strbuf buf = STRBUF_INIT;
1151 const char *p2 = arg, *p;
1152
1153 for (p = arg; *p; p++) {
1154 int ws = isspace(*p);
1155 if (!ws && *p != '\\' && *p != '"' && *p != '{' && *p != '\'' &&
1156 *p != '?' && *p != '*' && *p != '~')
1157 continue;
1158 if (!buf.len)
1159 strbuf_addch(&buf, '"');
1160 if (p != p2)
1161 strbuf_add(&buf, p2, p - p2);
1162 if (*p == '\\' || *p == '"')
1163 strbuf_addch(&buf, '\\');
1164 p2 = p;
1165 }
1166
1167 if (p == arg)
1168 strbuf_addch(&buf, '"');
1169 else if (!buf.len)
1170 return arg;
1171 else
1172 strbuf_add(&buf, p2, p - p2);
1173
1174 strbuf_addch(&buf, '"');
1175 return strbuf_detach(&buf, 0);
1176 }
1177
1178 static const char *parse_interpreter(const char *cmd)
1179 {
1180 static char buf[100];
1181 char *p, *opt;
1182 int n, fd;
1183
1184 /* don't even try a .exe */
1185 n = strlen(cmd);
1186 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1187 return NULL;
1188
1189 fd = open(cmd, O_RDONLY);
1190 if (fd < 0)
1191 return NULL;
1192 n = read(fd, buf, sizeof(buf)-1);
1193 close(fd);
1194 if (n < 4) /* at least '#!/x' and not error */
1195 return NULL;
1196
1197 if (buf[0] != '#' || buf[1] != '!')
1198 return NULL;
1199 buf[n] = '\0';
1200 p = buf + strcspn(buf, "\r\n");
1201 if (!*p)
1202 return NULL;
1203
1204 *p = '\0';
1205 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1206 return NULL;
1207 /* strip options */
1208 if ((opt = strchr(p+1, ' ')))
1209 *opt = '\0';
1210 return p+1;
1211 }
1212
1213 /*
1214 * exe_only means that we only want to detect .exe files, but not scripts
1215 * (which do not have an extension)
1216 */
1217 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1218 int isexe, int exe_only)
1219 {
1220 char path[MAX_PATH];
1221 wchar_t wpath[MAX_PATH];
1222 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1223
1224 if (xutftowcs_path(wpath, path) < 0)
1225 return NULL;
1226
1227 if (!isexe && _waccess(wpath, F_OK) == 0)
1228 return xstrdup(path);
1229 wpath[wcslen(wpath)-4] = '\0';
1230 if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
1231 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
1232 path[strlen(path)-4] = '\0';
1233 return xstrdup(path);
1234 }
1235 }
1236 return NULL;
1237 }
1238
1239 /*
1240 * Determines the absolute path of cmd using the split path in path.
1241 * If cmd contains a slash or backslash, no lookup is performed.
1242 */
1243 static char *path_lookup(const char *cmd, int exe_only)
1244 {
1245 const char *path;
1246 char *prog = NULL;
1247 int len = strlen(cmd);
1248 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1249
1250 if (strpbrk(cmd, "/\\"))
1251 return xstrdup(cmd);
1252
1253 path = mingw_getenv("PATH");
1254 if (!path)
1255 return NULL;
1256
1257 while (!prog) {
1258 const char *sep = strchrnul(path, ';');
1259 int dirlen = sep - path;
1260 if (dirlen)
1261 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1262 if (!*sep)
1263 break;
1264 path = sep + 1;
1265 }
1266
1267 return prog;
1268 }
1269
1270 static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
1271 {
1272 while (*s && *s != c)
1273 s++;
1274 return s;
1275 }
1276
1277 /* Compare only keys */
1278 static int wenvcmp(const void *a, const void *b)
1279 {
1280 wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
1281 size_t p_len, q_len;
1282
1283 /* Find the keys */
1284 p_len = wcschrnul(p, L'=') - p;
1285 q_len = wcschrnul(q, L'=') - q;
1286
1287 /* If the length differs, include the shorter key's NUL */
1288 if (p_len < q_len)
1289 p_len++;
1290 else if (p_len > q_len)
1291 p_len = q_len + 1;
1292
1293 return _wcsnicmp(p, q, p_len);
1294 }
1295
1296 /*
1297 * Build an environment block combining the inherited environment
1298 * merged with the given list of settings.
1299 *
1300 * Values of the form "KEY=VALUE" in deltaenv override inherited values.
1301 * Values of the form "KEY" in deltaenv delete inherited values.
1302 *
1303 * Multiple entries in deltaenv for the same key are explicitly allowed.
1304 *
1305 * We return a contiguous block of UNICODE strings with a final trailing
1306 * zero word.
1307 */
1308 static wchar_t *make_environment_block(char **deltaenv)
1309 {
1310 wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
1311 size_t wlen, s, delta_size, size;
1312
1313 wchar_t **array = NULL;
1314 size_t alloc = 0, nr = 0, i;
1315
1316 size = 1; /* for extra NUL at the end */
1317
1318 /* If there is no deltaenv to apply, simply return a copy. */
1319 if (!deltaenv || !*deltaenv) {
1320 for (p = wenv; p && *p; ) {
1321 size_t s = wcslen(p) + 1;
1322 size += s;
1323 p += s;
1324 }
1325
1326 ALLOC_ARRAY(result, size);
1327 COPY_ARRAY(result, wenv, size);
1328 FreeEnvironmentStringsW(wenv);
1329 return result;
1330 }
1331
1332 /*
1333 * If there is a deltaenv, let's accumulate all keys into `array`,
1334 * sort them using the stable git_stable_qsort() and then copy,
1335 * skipping duplicate keys
1336 */
1337 for (p = wenv; p && *p; ) {
1338 ALLOC_GROW(array, nr + 1, alloc);
1339 s = wcslen(p) + 1;
1340 array[nr++] = p;
1341 p += s;
1342 size += s;
1343 }
1344
1345 /* (over-)assess size needed for wchar version of deltaenv */
1346 for (delta_size = 0, i = 0; deltaenv[i]; i++)
1347 delta_size += strlen(deltaenv[i]) * 2 + 1;
1348 ALLOC_ARRAY(wdeltaenv, delta_size);
1349
1350 /* convert the deltaenv, appending to array */
1351 for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
1352 ALLOC_GROW(array, nr + 1, alloc);
1353 wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
1354 array[nr++] = p;
1355 p += wlen + 1;
1356 }
1357
1358 git_stable_qsort(array, nr, sizeof(*array), wenvcmp);
1359 ALLOC_ARRAY(result, size + delta_size);
1360
1361 for (p = result, i = 0; i < nr; i++) {
1362 /* Skip any duplicate keys; last one wins */
1363 while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
1364 i++;
1365
1366 /* Skip "to delete" entry */
1367 if (!wcschr(array[i], L'='))
1368 continue;
1369
1370 size = wcslen(array[i]) + 1;
1371 COPY_ARRAY(p, array[i], size);
1372 p += size;
1373 }
1374 *p = L'\0';
1375
1376 free(array);
1377 free(wdeltaenv);
1378 FreeEnvironmentStringsW(wenv);
1379 return result;
1380 }
1381
1382 static void do_unset_environment_variables(void)
1383 {
1384 static int done;
1385 char *p = unset_environment_variables;
1386
1387 if (done || !p)
1388 return;
1389 done = 1;
1390
1391 for (;;) {
1392 char *comma = strchr(p, ',');
1393
1394 if (comma)
1395 *comma = '\0';
1396 unsetenv(p);
1397 if (!comma)
1398 break;
1399 p = comma + 1;
1400 }
1401 }
1402
1403 struct pinfo_t {
1404 struct pinfo_t *next;
1405 pid_t pid;
1406 HANDLE proc;
1407 };
1408 static struct pinfo_t *pinfo = NULL;
1409 CRITICAL_SECTION pinfo_cs;
1410
1411 /* Used to match and chomp off path components */
1412 static inline int match_last_path_component(const char *path, size_t *len,
1413 const char *component)
1414 {
1415 size_t component_len = strlen(component);
1416 if (*len < component_len + 1 ||
1417 !is_dir_sep(path[*len - component_len - 1]) ||
1418 fspathncmp(path + *len - component_len, component, component_len))
1419 return 0;
1420 *len -= component_len + 1;
1421 /* chomp off repeated dir separators */
1422 while (*len > 0 && is_dir_sep(path[*len - 1]))
1423 (*len)--;
1424 return 1;
1425 }
1426
1427 static int is_msys2_sh(const char *cmd)
1428 {
1429 if (!cmd)
1430 return 0;
1431
1432 if (!strcmp(cmd, "sh")) {
1433 static int ret = -1;
1434 char *p;
1435
1436 if (ret >= 0)
1437 return ret;
1438
1439 p = path_lookup(cmd, 0);
1440 if (!p)
1441 ret = 0;
1442 else {
1443 size_t len = strlen(p);
1444
1445 ret = match_last_path_component(p, &len, "sh.exe") &&
1446 match_last_path_component(p, &len, "bin") &&
1447 match_last_path_component(p, &len, "usr");
1448 free(p);
1449 }
1450 return ret;
1451 }
1452
1453 if (ends_with(cmd, "\\sh.exe")) {
1454 static char *sh;
1455
1456 if (!sh)
1457 sh = path_lookup("sh", 0);
1458
1459 return !fspathcmp(cmd, sh);
1460 }
1461
1462 return 0;
1463 }
1464
1465 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1466 const char *dir,
1467 int prepend_cmd, int fhin, int fhout, int fherr)
1468 {
1469 static int restrict_handle_inheritance = -1;
1470 STARTUPINFOEXW si;
1471 PROCESS_INFORMATION pi;
1472 LPPROC_THREAD_ATTRIBUTE_LIST attr_list = NULL;
1473 HANDLE stdhandles[3];
1474 DWORD stdhandles_count = 0;
1475 SIZE_T size;
1476 struct strbuf args;
1477 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1478 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1479 BOOL ret;
1480 HANDLE cons;
1481 const char *(*quote_arg)(const char *arg) =
1482 is_msys2_sh(cmd ? cmd : *argv) ?
1483 quote_arg_msys2 : quote_arg_msvc;
1484
1485 /* Make sure to override previous errors, if any */
1486 errno = 0;
1487
1488 if (restrict_handle_inheritance < 0)
1489 restrict_handle_inheritance = core_restrict_inherited_handles;
1490 /*
1491 * The following code to restrict which handles are inherited seems
1492 * to work properly only on Windows 7 and later, so let's disable it
1493 * on Windows Vista and 2008.
1494 */
1495 if (restrict_handle_inheritance < 0)
1496 restrict_handle_inheritance = GetVersion() >> 16 >= 7601;
1497
1498 do_unset_environment_variables();
1499
1500 /* Determine whether or not we are associated to a console */
1501 cons = CreateFileW(L"CONOUT$", GENERIC_WRITE,
1502 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1503 FILE_ATTRIBUTE_NORMAL, NULL);
1504 if (cons == INVALID_HANDLE_VALUE) {
1505 /* There is no console associated with this process.
1506 * Since the child is a console process, Windows
1507 * would normally create a console window. But
1508 * since we'll be redirecting std streams, we do
1509 * not need the console.
1510 * It is necessary to use DETACHED_PROCESS
1511 * instead of CREATE_NO_WINDOW to make ssh
1512 * recognize that it has no console.
1513 */
1514 flags |= DETACHED_PROCESS;
1515 } else {
1516 /* There is already a console. If we specified
1517 * DETACHED_PROCESS here, too, Windows would
1518 * disassociate the child from the console.
1519 * The same is true for CREATE_NO_WINDOW.
1520 * Go figure!
1521 */
1522 CloseHandle(cons);
1523 }
1524 memset(&si, 0, sizeof(si));
1525 si.StartupInfo.cb = sizeof(si);
1526 si.StartupInfo.hStdInput = winansi_get_osfhandle(fhin);
1527 si.StartupInfo.hStdOutput = winansi_get_osfhandle(fhout);
1528 si.StartupInfo.hStdError = winansi_get_osfhandle(fherr);
1529
1530 /* The list of handles cannot contain duplicates */
1531 if (si.StartupInfo.hStdInput != INVALID_HANDLE_VALUE)
1532 stdhandles[stdhandles_count++] = si.StartupInfo.hStdInput;
1533 if (si.StartupInfo.hStdOutput != INVALID_HANDLE_VALUE &&
1534 si.StartupInfo.hStdOutput != si.StartupInfo.hStdInput)
1535 stdhandles[stdhandles_count++] = si.StartupInfo.hStdOutput;
1536 if (si.StartupInfo.hStdError != INVALID_HANDLE_VALUE &&
1537 si.StartupInfo.hStdError != si.StartupInfo.hStdInput &&
1538 si.StartupInfo.hStdError != si.StartupInfo.hStdOutput)
1539 stdhandles[stdhandles_count++] = si.StartupInfo.hStdError;
1540 if (stdhandles_count)
1541 si.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;
1542
1543 if (*argv && !strcmp(cmd, *argv))
1544 wcmd[0] = L'\0';
1545 else if (xutftowcs_path(wcmd, cmd) < 0)
1546 return -1;
1547 if (dir && xutftowcs_path(wdir, dir) < 0)
1548 return -1;
1549
1550 /* concatenate argv, quoting args as we go */
1551 strbuf_init(&args, 0);
1552 if (prepend_cmd) {
1553 char *quoted = (char *)quote_arg(cmd);
1554 strbuf_addstr(&args, quoted);
1555 if (quoted != cmd)
1556 free(quoted);
1557 }
1558 for (; *argv; argv++) {
1559 char *quoted = (char *)quote_arg(*argv);
1560 if (*args.buf)
1561 strbuf_addch(&args, ' ');
1562 strbuf_addstr(&args, quoted);
1563 if (quoted != *argv)
1564 free(quoted);
1565 }
1566
1567 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1568 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1569 strbuf_release(&args);
1570
1571 wenvblk = make_environment_block(deltaenv);
1572
1573 memset(&pi, 0, sizeof(pi));
1574 if (restrict_handle_inheritance && stdhandles_count &&
1575 (InitializeProcThreadAttributeList(NULL, 1, 0, &size) ||
1576 GetLastError() == ERROR_INSUFFICIENT_BUFFER) &&
1577 (attr_list = (LPPROC_THREAD_ATTRIBUTE_LIST)
1578 (HeapAlloc(GetProcessHeap(), 0, size))) &&
1579 InitializeProcThreadAttributeList(attr_list, 1, 0, &size) &&
1580 UpdateProcThreadAttribute(attr_list, 0,
1581 PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
1582 stdhandles,
1583 stdhandles_count * sizeof(HANDLE),
1584 NULL, NULL)) {
1585 si.lpAttributeList = attr_list;
1586 flags |= EXTENDED_STARTUPINFO_PRESENT;
1587 }
1588
1589 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1590 stdhandles_count ? TRUE : FALSE,
1591 flags, wenvblk, dir ? wdir : NULL,
1592 &si.StartupInfo, &pi);
1593
1594 /*
1595 * On Windows 2008 R2, it seems that specifying certain types of handles
1596 * (such as FILE_TYPE_CHAR or FILE_TYPE_PIPE) will always produce an
1597 * error. Rather than playing finicky and fragile games, let's just try
1598 * to detect this situation and simply try again without restricting any
1599 * handle inheritance. This is still better than failing to create
1600 * processes.
1601 */
1602 if (!ret && restrict_handle_inheritance && stdhandles_count) {
1603 DWORD err = GetLastError();
1604 struct strbuf buf = STRBUF_INIT;
1605
1606 if (err != ERROR_NO_SYSTEM_RESOURCES &&
1607 /*
1608 * On Windows 7 and earlier, handles on pipes and character
1609 * devices are inherited automatically, and cannot be
1610 * specified in the thread handle list. Rather than trying
1611 * to catch each and every corner case (and running the
1612 * chance of *still* forgetting a few), let's just fall
1613 * back to creating the process without trying to limit the
1614 * handle inheritance.
1615 */
1616 !(err == ERROR_INVALID_PARAMETER &&
1617 GetVersion() >> 16 < 9200) &&
1618 !getenv("SUPPRESS_HANDLE_INHERITANCE_WARNING")) {
1619 DWORD fl = 0;
1620 int i;
1621
1622 setenv("SUPPRESS_HANDLE_INHERITANCE_WARNING", "1", 1);
1623
1624 for (i = 0; i < stdhandles_count; i++) {
1625 HANDLE h = stdhandles[i];
1626 strbuf_addf(&buf, "handle #%d: %p (type %lx, "
1627 "handle info (%d) %lx\n", i, h,
1628 GetFileType(h),
1629 GetHandleInformation(h, &fl),
1630 fl);
1631 }
1632 strbuf_addstr(&buf, "\nThis is a bug; please report it "
1633 "at\nhttps://github.com/git-for-windows/"
1634 "git/issues/new\n\n"
1635 "To suppress this warning, please set "
1636 "the environment variable\n\n"
1637 "\tSUPPRESS_HANDLE_INHERITANCE_WARNING=1"
1638 "\n");
1639 }
1640 restrict_handle_inheritance = 0;
1641 flags &= ~EXTENDED_STARTUPINFO_PRESENT;
1642 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1643 TRUE, flags, wenvblk, dir ? wdir : NULL,
1644 &si.StartupInfo, &pi);
1645 if (!ret)
1646 errno = err_win_to_posix(GetLastError());
1647 if (ret && buf.len) {
1648 warning("failed to restrict file handles (%ld)\n\n%s",
1649 err, buf.buf);
1650 }
1651 strbuf_release(&buf);
1652 } else if (!ret)
1653 errno = err_win_to_posix(GetLastError());
1654
1655 if (si.lpAttributeList)
1656 DeleteProcThreadAttributeList(si.lpAttributeList);
1657 if (attr_list)
1658 HeapFree(GetProcessHeap(), 0, attr_list);
1659
1660 free(wenvblk);
1661 free(wargs);
1662
1663 if (!ret)
1664 return -1;
1665
1666 CloseHandle(pi.hThread);
1667
1668 /*
1669 * The process ID is the human-readable identifier of the process
1670 * that we want to present in log and error messages. The handle
1671 * is not useful for this purpose. But we cannot close it, either,
1672 * because it is not possible to turn a process ID into a process
1673 * handle after the process terminated.
1674 * Keep the handle in a list for waitpid.
1675 */
1676 EnterCriticalSection(&pinfo_cs);
1677 {
1678 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1679 info->pid = pi.dwProcessId;
1680 info->proc = pi.hProcess;
1681 info->next = pinfo;
1682 pinfo = info;
1683 }
1684 LeaveCriticalSection(&pinfo_cs);
1685
1686 return (pid_t)pi.dwProcessId;
1687 }
1688
1689 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1690 {
1691 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1692 }
1693
1694 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1695 const char *dir,
1696 int fhin, int fhout, int fherr)
1697 {
1698 pid_t pid;
1699 char *prog = path_lookup(cmd, 0);
1700
1701 if (!prog) {
1702 errno = ENOENT;
1703 pid = -1;
1704 }
1705 else {
1706 const char *interpr = parse_interpreter(prog);
1707
1708 if (interpr) {
1709 const char *argv0 = argv[0];
1710 char *iprog = path_lookup(interpr, 1);
1711 argv[0] = prog;
1712 if (!iprog) {
1713 errno = ENOENT;
1714 pid = -1;
1715 }
1716 else {
1717 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1718 fhin, fhout, fherr);
1719 free(iprog);
1720 }
1721 argv[0] = argv0;
1722 }
1723 else
1724 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1725 fhin, fhout, fherr);
1726 free(prog);
1727 }
1728 return pid;
1729 }
1730
1731 static int try_shell_exec(const char *cmd, char *const *argv)
1732 {
1733 const char *interpr = parse_interpreter(cmd);
1734 char *prog;
1735 int pid = 0;
1736
1737 if (!interpr)
1738 return 0;
1739 prog = path_lookup(interpr, 1);
1740 if (prog) {
1741 int exec_id;
1742 int argc = 0;
1743 #ifndef _MSC_VER
1744 const
1745 #endif
1746 char **argv2;
1747 while (argv[argc]) argc++;
1748 ALLOC_ARRAY(argv2, argc + 1);
1749 argv2[0] = (char *)cmd; /* full path to the script file */
1750 COPY_ARRAY(&argv2[1], &argv[1], argc);
1751 exec_id = trace2_exec(prog, argv2);
1752 pid = mingw_spawnv(prog, argv2, 1);
1753 if (pid >= 0) {
1754 int status;
1755 if (waitpid(pid, &status, 0) < 0)
1756 status = 255;
1757 trace2_exec_result(exec_id, status);
1758 exit(status);
1759 }
1760 trace2_exec_result(exec_id, -1);
1761 pid = 1; /* indicate that we tried but failed */
1762 free(prog);
1763 free(argv2);
1764 }
1765 return pid;
1766 }
1767
1768 int mingw_execv(const char *cmd, char *const *argv)
1769 {
1770 /* check if git_command is a shell script */
1771 if (!try_shell_exec(cmd, argv)) {
1772 int pid, status;
1773 int exec_id;
1774
1775 exec_id = trace2_exec(cmd, (const char **)argv);
1776 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1777 if (pid < 0) {
1778 trace2_exec_result(exec_id, -1);
1779 return -1;
1780 }
1781 if (waitpid(pid, &status, 0) < 0)
1782 status = 255;
1783 trace2_exec_result(exec_id, status);
1784 exit(status);
1785 }
1786 return -1;
1787 }
1788
1789 int mingw_execvp(const char *cmd, char *const *argv)
1790 {
1791 char *prog = path_lookup(cmd, 0);
1792
1793 if (prog) {
1794 mingw_execv(prog, argv);
1795 free(prog);
1796 } else
1797 errno = ENOENT;
1798
1799 return -1;
1800 }
1801
1802 int mingw_kill(pid_t pid, int sig)
1803 {
1804 if (pid > 0 && sig == SIGTERM) {
1805 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1806
1807 if (TerminateProcess(h, -1)) {
1808 CloseHandle(h);
1809 return 0;
1810 }
1811
1812 errno = err_win_to_posix(GetLastError());
1813 CloseHandle(h);
1814 return -1;
1815 } else if (pid > 0 && sig == 0) {
1816 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1817 if (h) {
1818 CloseHandle(h);
1819 return 0;
1820 }
1821 }
1822
1823 errno = EINVAL;
1824 return -1;
1825 }
1826
1827 /*
1828 * UTF-8 versions of getenv(), putenv() and unsetenv().
1829 * Internally, they use the CRT's stock UNICODE routines
1830 * to avoid data loss.
1831 */
1832 char *mingw_getenv(const char *name)
1833 {
1834 #define GETENV_MAX_RETAIN 64
1835 static char *values[GETENV_MAX_RETAIN];
1836 static int value_counter;
1837 int len_key, len_value;
1838 wchar_t *w_key;
1839 char *value;
1840 wchar_t w_value[32768];
1841
1842 if (!name || !*name)
1843 return NULL;
1844
1845 len_key = strlen(name) + 1;
1846 /* We cannot use xcalloc() here because that uses getenv() itself */
1847 w_key = calloc(len_key, sizeof(wchar_t));
1848 if (!w_key)
1849 die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
1850 xutftowcs(w_key, name, len_key);
1851 /* GetEnvironmentVariableW() only sets the last error upon failure */
1852 SetLastError(ERROR_SUCCESS);
1853 len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
1854 if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
1855 free(w_key);
1856 return NULL;
1857 }
1858 free(w_key);
1859
1860 len_value = len_value * 3 + 1;
1861 /* We cannot use xcalloc() here because that uses getenv() itself */
1862 value = calloc(len_value, sizeof(char));
1863 if (!value)
1864 die("Out of memory, (tried to allocate %u bytes)", len_value);
1865 xwcstoutf(value, w_value, len_value);
1866
1867 /*
1868 * We return `value` which is an allocated value and the caller is NOT
1869 * expecting to have to free it, so we keep a round-robin array,
1870 * invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
1871 */
1872 free(values[value_counter]);
1873 values[value_counter++] = value;
1874 if (value_counter >= ARRAY_SIZE(values))
1875 value_counter = 0;
1876
1877 return value;
1878 }
1879
1880 int mingw_putenv(const char *namevalue)
1881 {
1882 int size;
1883 wchar_t *wide, *equal;
1884 BOOL result;
1885
1886 if (!namevalue || !*namevalue)
1887 return 0;
1888
1889 size = strlen(namevalue) * 2 + 1;
1890 wide = calloc(size, sizeof(wchar_t));
1891 if (!wide)
1892 die("Out of memory, (tried to allocate %u wchar_t's)", size);
1893 xutftowcs(wide, namevalue, size);
1894 equal = wcschr(wide, L'=');
1895 if (!equal)
1896 result = SetEnvironmentVariableW(wide, NULL);
1897 else {
1898 *equal = L'\0';
1899 result = SetEnvironmentVariableW(wide, equal + 1);
1900 }
1901 free(wide);
1902
1903 if (!result)
1904 errno = err_win_to_posix(GetLastError());
1905
1906 return result ? 0 : -1;
1907 }
1908
1909 static void ensure_socket_initialization(void)
1910 {
1911 WSADATA wsa;
1912 static int initialized = 0;
1913
1914 if (initialized)
1915 return;
1916
1917 if (WSAStartup(MAKEWORD(2,2), &wsa))
1918 die("unable to initialize winsock subsystem, error %d",
1919 WSAGetLastError());
1920
1921 atexit((void(*)(void)) WSACleanup);
1922 initialized = 1;
1923 }
1924
1925 #undef gethostname
1926 int mingw_gethostname(char *name, int namelen)
1927 {
1928 ensure_socket_initialization();
1929 return gethostname(name, namelen);
1930 }
1931
1932 #undef gethostbyname
1933 struct hostent *mingw_gethostbyname(const char *host)
1934 {
1935 ensure_socket_initialization();
1936 return gethostbyname(host);
1937 }
1938
1939 #undef getaddrinfo
1940 int mingw_getaddrinfo(const char *node, const char *service,
1941 const struct addrinfo *hints, struct addrinfo **res)
1942 {
1943 ensure_socket_initialization();
1944 return getaddrinfo(node, service, hints, res);
1945 }
1946
1947 int mingw_socket(int domain, int type, int protocol)
1948 {
1949 int sockfd;
1950 SOCKET s;
1951
1952 ensure_socket_initialization();
1953 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1954 if (s == INVALID_SOCKET) {
1955 /*
1956 * WSAGetLastError() values are regular BSD error codes
1957 * biased by WSABASEERR.
1958 * However, strerror() does not know about networking
1959 * specific errors, which are values beginning at 38 or so.
1960 * Therefore, we choose to leave the biased error code
1961 * in errno so that _if_ someone looks up the code somewhere,
1962 * then it is at least the number that are usually listed.
1963 */
1964 errno = WSAGetLastError();
1965 return -1;
1966 }
1967 /* convert into a file descriptor */
1968 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1969 closesocket(s);
1970 return error("unable to make a socket file descriptor: %s",
1971 strerror(errno));
1972 }
1973 return sockfd;
1974 }
1975
1976 #undef connect
1977 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1978 {
1979 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1980 return connect(s, sa, sz);
1981 }
1982
1983 #undef bind
1984 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1985 {
1986 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1987 return bind(s, sa, sz);
1988 }
1989
1990 #undef setsockopt
1991 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1992 {
1993 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1994 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1995 }
1996
1997 #undef shutdown
1998 int mingw_shutdown(int sockfd, int how)
1999 {
2000 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2001 return shutdown(s, how);
2002 }
2003
2004 #undef listen
2005 int mingw_listen(int sockfd, int backlog)
2006 {
2007 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2008 return listen(s, backlog);
2009 }
2010
2011 #undef accept
2012 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
2013 {
2014 int sockfd2;
2015
2016 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
2017 SOCKET s2 = accept(s1, sa, sz);
2018
2019 /* convert into a file descriptor */
2020 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
2021 int err = errno;
2022 closesocket(s2);
2023 return error("unable to make a socket file descriptor: %s",
2024 strerror(err));
2025 }
2026 return sockfd2;
2027 }
2028
2029 #undef rename
2030 int mingw_rename(const char *pold, const char *pnew)
2031 {
2032 DWORD attrs, gle;
2033 int tries = 0;
2034 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
2035 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
2036 return -1;
2037
2038 /*
2039 * Try native rename() first to get errno right.
2040 * It is based on MoveFile(), which cannot overwrite existing files.
2041 */
2042 if (!_wrename(wpold, wpnew))
2043 return 0;
2044 if (errno != EEXIST)
2045 return -1;
2046 repeat:
2047 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2048 return 0;
2049 /* TODO: translate more errors */
2050 gle = GetLastError();
2051 if (gle == ERROR_ACCESS_DENIED &&
2052 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
2053 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
2054 DWORD attrsold = GetFileAttributesW(wpold);
2055 if (attrsold == INVALID_FILE_ATTRIBUTES ||
2056 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
2057 errno = EISDIR;
2058 else if (!_wrmdir(wpnew))
2059 goto repeat;
2060 return -1;
2061 }
2062 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
2063 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
2064 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2065 return 0;
2066 gle = GetLastError();
2067 /* revert file attributes on failure */
2068 SetFileAttributesW(wpnew, attrs);
2069 }
2070 }
2071 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
2072 /*
2073 * We assume that some other process had the source or
2074 * destination file open at the wrong moment and retry.
2075 * In order to give the other process a higher chance to
2076 * complete its operation, we give up our time slice now.
2077 * If we have to retry again, we do sleep a bit.
2078 */
2079 Sleep(delay[tries]);
2080 tries++;
2081 goto repeat;
2082 }
2083 if (gle == ERROR_ACCESS_DENIED &&
2084 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
2085 "Should I try again?", pold, pnew))
2086 goto repeat;
2087
2088 errno = EACCES;
2089 return -1;
2090 }
2091
2092 /*
2093 * Note that this doesn't return the actual pagesize, but
2094 * the allocation granularity. If future Windows specific git code
2095 * needs the real getpagesize function, we need to find another solution.
2096 */
2097 int mingw_getpagesize(void)
2098 {
2099 SYSTEM_INFO si;
2100 GetSystemInfo(&si);
2101 return si.dwAllocationGranularity;
2102 }
2103
2104 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
2105 enum EXTENDED_NAME_FORMAT {
2106 NameDisplay = 3,
2107 NameUserPrincipal = 8
2108 };
2109
2110 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
2111 {
2112 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
2113 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
2114 static wchar_t wbuffer[1024];
2115 DWORD len;
2116
2117 if (!INIT_PROC_ADDR(GetUserNameExW))
2118 return NULL;
2119
2120 len = ARRAY_SIZE(wbuffer);
2121 if (GetUserNameExW(type, wbuffer, &len)) {
2122 char *converted = xmalloc((len *= 3));
2123 if (xwcstoutf(converted, wbuffer, len) >= 0)
2124 return converted;
2125 free(converted);
2126 }
2127
2128 return NULL;
2129 }
2130
2131 char *mingw_query_user_email(void)
2132 {
2133 return get_extended_user_info(NameUserPrincipal);
2134 }
2135
2136 struct passwd *getpwuid(int uid)
2137 {
2138 static unsigned initialized;
2139 static char user_name[100];
2140 static struct passwd *p;
2141 wchar_t buf[100];
2142 DWORD len;
2143
2144 if (initialized)
2145 return p;
2146
2147 len = ARRAY_SIZE(buf);
2148 if (!GetUserNameW(buf, &len)) {
2149 initialized = 1;
2150 return NULL;
2151 }
2152
2153 if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) {
2154 initialized = 1;
2155 return NULL;
2156 }
2157
2158 p = xmalloc(sizeof(*p));
2159 p->pw_name = user_name;
2160 p->pw_gecos = get_extended_user_info(NameDisplay);
2161 if (!p->pw_gecos)
2162 p->pw_gecos = "unknown";
2163 p->pw_dir = NULL;
2164
2165 initialized = 1;
2166 return p;
2167 }
2168
2169 static HANDLE timer_event;
2170 static HANDLE timer_thread;
2171 static int timer_interval;
2172 static int one_shot;
2173 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
2174
2175 /* The timer works like this:
2176 * The thread, ticktack(), is a trivial routine that most of the time
2177 * only waits to receive the signal to terminate. The main thread tells
2178 * the thread to terminate by setting the timer_event to the signalled
2179 * state.
2180 * But ticktack() interrupts the wait state after the timer's interval
2181 * length to call the signal handler.
2182 */
2183
2184 static unsigned __stdcall ticktack(void *dummy)
2185 {
2186 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
2187 mingw_raise(SIGALRM);
2188 if (one_shot)
2189 break;
2190 }
2191 return 0;
2192 }
2193
2194 static int start_timer_thread(void)
2195 {
2196 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
2197 if (timer_event) {
2198 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
2199 if (!timer_thread )
2200 return errno = ENOMEM,
2201 error("cannot start timer thread");
2202 } else
2203 return errno = ENOMEM,
2204 error("cannot allocate resources for timer");
2205 return 0;
2206 }
2207
2208 static void stop_timer_thread(void)
2209 {
2210 if (timer_event)
2211 SetEvent(timer_event); /* tell thread to terminate */
2212 if (timer_thread) {
2213 int rc = WaitForSingleObject(timer_thread, 10000);
2214 if (rc == WAIT_TIMEOUT)
2215 error("timer thread did not terminate timely");
2216 else if (rc != WAIT_OBJECT_0)
2217 error("waiting for timer thread failed: %lu",
2218 GetLastError());
2219 CloseHandle(timer_thread);
2220 }
2221 if (timer_event)
2222 CloseHandle(timer_event);
2223 timer_event = NULL;
2224 timer_thread = NULL;
2225 }
2226
2227 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
2228 {
2229 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
2230 }
2231
2232 int setitimer(int type, struct itimerval *in, struct itimerval *out)
2233 {
2234 static const struct timeval zero;
2235 static int atexit_done;
2236
2237 if (out != NULL)
2238 return errno = EINVAL,
2239 error("setitimer param 3 != NULL not implemented");
2240 if (!is_timeval_eq(&in->it_interval, &zero) &&
2241 !is_timeval_eq(&in->it_interval, &in->it_value))
2242 return errno = EINVAL,
2243 error("setitimer: it_interval must be zero or eq it_value");
2244
2245 if (timer_thread)
2246 stop_timer_thread();
2247
2248 if (is_timeval_eq(&in->it_value, &zero) &&
2249 is_timeval_eq(&in->it_interval, &zero))
2250 return 0;
2251
2252 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2253 one_shot = is_timeval_eq(&in->it_interval, &zero);
2254 if (!atexit_done) {
2255 atexit(stop_timer_thread);
2256 atexit_done = 1;
2257 }
2258 return start_timer_thread();
2259 }
2260
2261 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2262 {
2263 if (sig != SIGALRM)
2264 return errno = EINVAL,
2265 error("sigaction only implemented for SIGALRM");
2266 if (out != NULL)
2267 return errno = EINVAL,
2268 error("sigaction: param 3 != NULL not implemented");
2269
2270 timer_fn = in->sa_handler;
2271 return 0;
2272 }
2273
2274 #undef signal
2275 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2276 {
2277 sig_handler_t old;
2278
2279 switch (sig) {
2280 case SIGALRM:
2281 old = timer_fn;
2282 timer_fn = handler;
2283 break;
2284
2285 case SIGINT:
2286 old = sigint_fn;
2287 sigint_fn = handler;
2288 break;
2289
2290 default:
2291 return signal(sig, handler);
2292 }
2293
2294 return old;
2295 }
2296
2297 #undef raise
2298 int mingw_raise(int sig)
2299 {
2300 switch (sig) {
2301 case SIGALRM:
2302 if (timer_fn == SIG_DFL) {
2303 if (isatty(STDERR_FILENO))
2304 fputs("Alarm clock\n", stderr);
2305 exit(128 + SIGALRM);
2306 } else if (timer_fn != SIG_IGN)
2307 timer_fn(SIGALRM);
2308 return 0;
2309
2310 case SIGINT:
2311 if (sigint_fn == SIG_DFL)
2312 exit(128 + SIGINT);
2313 else if (sigint_fn != SIG_IGN)
2314 sigint_fn(SIGINT);
2315 return 0;
2316
2317 #if defined(_MSC_VER)
2318 case SIGILL:
2319 case SIGFPE:
2320 case SIGSEGV:
2321 case SIGTERM:
2322 case SIGBREAK:
2323 case SIGABRT:
2324 case SIGABRT_COMPAT:
2325 /*
2326 * The <signal.h> header in the MS C Runtime defines 8 signals
2327 * as being supported on the platform. Anything else causes an
2328 * "Invalid signal or error" (which in DEBUG builds causes the
2329 * Abort/Retry/Ignore dialog). We by-pass the CRT for things we
2330 * already know will fail.
2331 */
2332 return raise(sig);
2333 default:
2334 errno = EINVAL;
2335 return -1;
2336
2337 #else
2338
2339 default:
2340 return raise(sig);
2341
2342 #endif
2343
2344 }
2345 }
2346
2347 int link(const char *oldpath, const char *newpath)
2348 {
2349 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2350 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2351 xutftowcs_path(wnewpath, newpath) < 0)
2352 return -1;
2353
2354 if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
2355 errno = err_win_to_posix(GetLastError());
2356 return -1;
2357 }
2358 return 0;
2359 }
2360
2361 pid_t waitpid(pid_t pid, int *status, int options)
2362 {
2363 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2364 FALSE, pid);
2365 if (!h) {
2366 errno = ECHILD;
2367 return -1;
2368 }
2369
2370 if (pid > 0 && options & WNOHANG) {
2371 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2372 CloseHandle(h);
2373 return 0;
2374 }
2375 options &= ~WNOHANG;
2376 }
2377
2378 if (options == 0) {
2379 struct pinfo_t **ppinfo;
2380 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2381 CloseHandle(h);
2382 return 0;
2383 }
2384
2385 if (status)
2386 GetExitCodeProcess(h, (LPDWORD)status);
2387
2388 EnterCriticalSection(&pinfo_cs);
2389
2390 ppinfo = &pinfo;
2391 while (*ppinfo) {
2392 struct pinfo_t *info = *ppinfo;
2393 if (info->pid == pid) {
2394 CloseHandle(info->proc);
2395 *ppinfo = info->next;
2396 free(info);
2397 break;
2398 }
2399 ppinfo = &info->next;
2400 }
2401
2402 LeaveCriticalSection(&pinfo_cs);
2403
2404 CloseHandle(h);
2405 return pid;
2406 }
2407 CloseHandle(h);
2408
2409 errno = EINVAL;
2410 return -1;
2411 }
2412
2413 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2414 {
2415 int upos = 0, wpos = 0;
2416 const unsigned char *utf = (const unsigned char*) utfs;
2417 if (!utf || !wcs || wcslen < 1) {
2418 errno = EINVAL;
2419 return -1;
2420 }
2421 /* reserve space for \0 */
2422 wcslen--;
2423 if (utflen < 0)
2424 utflen = INT_MAX;
2425
2426 while (upos < utflen) {
2427 int c = utf[upos++] & 0xff;
2428 if (utflen == INT_MAX && c == 0)
2429 break;
2430
2431 if (wpos >= wcslen) {
2432 wcs[wpos] = 0;
2433 errno = ERANGE;
2434 return -1;
2435 }
2436
2437 if (c < 0x80) {
2438 /* ASCII */
2439 wcs[wpos++] = c;
2440 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2441 (utf[upos] & 0xc0) == 0x80) {
2442 /* 2-byte utf-8 */
2443 c = ((c & 0x1f) << 6);
2444 c |= (utf[upos++] & 0x3f);
2445 wcs[wpos++] = c;
2446 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2447 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2448 (utf[upos] & 0xc0) == 0x80 &&
2449 (utf[upos + 1] & 0xc0) == 0x80) {
2450 /* 3-byte utf-8 */
2451 c = ((c & 0x0f) << 12);
2452 c |= ((utf[upos++] & 0x3f) << 6);
2453 c |= (utf[upos++] & 0x3f);
2454 wcs[wpos++] = c;
2455 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2456 wpos + 1 < wcslen &&
2457 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2458 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2459 (utf[upos] & 0xc0) == 0x80 &&
2460 (utf[upos + 1] & 0xc0) == 0x80 &&
2461 (utf[upos + 2] & 0xc0) == 0x80) {
2462 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2463 c = ((c & 0x07) << 18);
2464 c |= ((utf[upos++] & 0x3f) << 12);
2465 c |= ((utf[upos++] & 0x3f) << 6);
2466 c |= (utf[upos++] & 0x3f);
2467 c -= 0x10000;
2468 wcs[wpos++] = 0xd800 | (c >> 10);
2469 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2470 } else if (c >= 0xa0) {
2471 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2472 wcs[wpos++] = c;
2473 } else {
2474 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2475 static const char *hex = "0123456789abcdef";
2476 wcs[wpos++] = hex[c >> 4];
2477 if (wpos < wcslen)
2478 wcs[wpos++] = hex[c & 0x0f];
2479 }
2480 }
2481 wcs[wpos] = 0;
2482 return wpos;
2483 }
2484
2485 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2486 {
2487 if (!wcs || !utf || utflen < 1) {
2488 errno = EINVAL;
2489 return -1;
2490 }
2491 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2492 if (utflen)
2493 return utflen - 1;
2494 errno = ERANGE;
2495 return -1;
2496 }
2497
2498 static void setup_windows_environment(void)
2499 {
2500 char *tmp = getenv("TMPDIR");
2501
2502 /* on Windows it is TMP and TEMP */
2503 if (!tmp) {
2504 if (!(tmp = getenv("TMP")))
2505 tmp = getenv("TEMP");
2506 if (tmp) {
2507 setenv("TMPDIR", tmp, 1);
2508 tmp = getenv("TMPDIR");
2509 }
2510 }
2511
2512 if (tmp) {
2513 /*
2514 * Convert all dir separators to forward slashes,
2515 * to help shell commands called from the Git
2516 * executable (by not mistaking the dir separators
2517 * for escape characters).
2518 */
2519 convert_slashes(tmp);
2520 }
2521
2522 /* simulate TERM to enable auto-color (see color.c) */
2523 if (!getenv("TERM"))
2524 setenv("TERM", "cygwin", 1);
2525
2526 /* calculate HOME if not set */
2527 if (!getenv("HOME")) {
2528 /*
2529 * try $HOMEDRIVE$HOMEPATH - the home share may be a network
2530 * location, thus also check if the path exists (i.e. is not
2531 * disconnected)
2532 */
2533 if ((tmp = getenv("HOMEDRIVE"))) {
2534 struct strbuf buf = STRBUF_INIT;
2535 strbuf_addstr(&buf, tmp);
2536 if ((tmp = getenv("HOMEPATH"))) {
2537 strbuf_addstr(&buf, tmp);
2538 if (is_directory(buf.buf))
2539 setenv("HOME", buf.buf, 1);
2540 else
2541 tmp = NULL; /* use $USERPROFILE */
2542 }
2543 strbuf_release(&buf);
2544 }
2545 /* use $USERPROFILE if the home share is not available */
2546 if (!tmp && (tmp = getenv("USERPROFILE")))
2547 setenv("HOME", tmp, 1);
2548 }
2549 }
2550
2551 int is_valid_win32_path(const char *path, int allow_literal_nul)
2552 {
2553 const char *p = path;
2554 int preceding_space_or_period = 0, i = 0, periods = 0;
2555
2556 if (!protect_ntfs)
2557 return 1;
2558
2559 skip_dos_drive_prefix((char **)&path);
2560 goto segment_start;
2561
2562 for (;;) {
2563 char c = *(path++);
2564 switch (c) {
2565 case '\0':
2566 case '/': case '\\':
2567 /* cannot end in ` ` or `.`, except for `.` and `..` */
2568 if (preceding_space_or_period &&
2569 (i != periods || periods > 2))
2570 return 0;
2571 if (!c)
2572 return 1;
2573
2574 i = periods = preceding_space_or_period = 0;
2575
2576 segment_start:
2577 switch (*path) {
2578 case 'a': case 'A': /* AUX */
2579 if (((c = path[++i]) != 'u' && c != 'U') ||
2580 ((c = path[++i]) != 'x' && c != 'X')) {
2581 not_a_reserved_name:
2582 path += i;
2583 continue;
2584 }
2585 break;
2586 case 'c': case 'C': /* COM<N>, CON, CONIN$, CONOUT$ */
2587 if ((c = path[++i]) != 'o' && c != 'O')
2588 goto not_a_reserved_name;
2589 c = path[++i];
2590 if (c == 'm' || c == 'M') { /* COM<N> */
2591 if (!isdigit(path[++i]))
2592 goto not_a_reserved_name;
2593 } else if (c == 'n' || c == 'N') { /* CON */
2594 c = path[i + 1];
2595 if ((c == 'i' || c == 'I') &&
2596 ((c = path[i + 2]) == 'n' ||
2597 c == 'N') &&
2598 path[i + 3] == '$')
2599 i += 3; /* CONIN$ */
2600 else if ((c == 'o' || c == 'O') &&
2601 ((c = path[i + 2]) == 'u' ||
2602 c == 'U') &&
2603 ((c = path[i + 3]) == 't' ||
2604 c == 'T') &&
2605 path[i + 4] == '$')
2606 i += 4; /* CONOUT$ */
2607 } else
2608 goto not_a_reserved_name;
2609 break;
2610 case 'l': case 'L': /* LPT<N> */
2611 if (((c = path[++i]) != 'p' && c != 'P') ||
2612 ((c = path[++i]) != 't' && c != 'T') ||
2613 !isdigit(path[++i]))
2614 goto not_a_reserved_name;
2615 break;
2616 case 'n': case 'N': /* NUL */
2617 if (((c = path[++i]) != 'u' && c != 'U') ||
2618 ((c = path[++i]) != 'l' && c != 'L') ||
2619 (allow_literal_nul &&
2620 !path[i + 1] && p == path))
2621 goto not_a_reserved_name;
2622 break;
2623 case 'p': case 'P': /* PRN */
2624 if (((c = path[++i]) != 'r' && c != 'R') ||
2625 ((c = path[++i]) != 'n' && c != 'N'))
2626 goto not_a_reserved_name;
2627 break;
2628 default:
2629 continue;
2630 }
2631
2632 /*
2633 * So far, this looks like a reserved name. Let's see
2634 * whether it actually is one: trailing spaces, a file
2635 * extension, or an NTFS Alternate Data Stream do not
2636 * matter, the name is still reserved if any of those
2637 * follow immediately after the actual name.
2638 */
2639 i++;
2640 if (path[i] == ' ') {
2641 preceding_space_or_period = 1;
2642 while (path[++i] == ' ')
2643 ; /* skip all spaces */
2644 }
2645
2646 c = path[i];
2647 if (c && c != '.' && c != ':' && c != '/' && c != '\\')
2648 goto not_a_reserved_name;
2649
2650 /* contains reserved name */
2651 return 0;
2652 case '.':
2653 periods++;
2654 /* fallthru */
2655 case ' ':
2656 preceding_space_or_period = 1;
2657 i++;
2658 continue;
2659 case ':': /* DOS drive prefix was already skipped */
2660 case '<': case '>': case '"': case '|': case '?': case '*':
2661 /* illegal character */
2662 return 0;
2663 default:
2664 if (c > '\0' && c < '\x20')
2665 /* illegal character */
2666 return 0;
2667 }
2668 preceding_space_or_period = 0;
2669 i++;
2670 }
2671 }
2672
2673 #if !defined(_MSC_VER)
2674 /*
2675 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2676 * mingw startup code, see init.c in mingw runtime).
2677 */
2678 int _CRT_glob = 0;
2679 #endif
2680
2681 static NORETURN void die_startup(void)
2682 {
2683 fputs("fatal: not enough memory for initialization", stderr);
2684 exit(128);
2685 }
2686
2687 static void *malloc_startup(size_t size)
2688 {
2689 void *result = malloc(size);
2690 if (!result)
2691 die_startup();
2692 return result;
2693 }
2694
2695 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2696 {
2697 len = xwcstoutf(buffer, wcs, len) + 1;
2698 return memcpy(malloc_startup(len), buffer, len);
2699 }
2700
2701 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2702 DWORD desired_access, DWORD flags)
2703 {
2704 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2705 wchar_t buf[MAX_PATH];
2706 DWORD max = ARRAY_SIZE(buf);
2707 HANDLE handle;
2708 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2709
2710 if (!ret || ret >= max)
2711 return;
2712
2713 /* make sure this does not leak into child processes */
2714 SetEnvironmentVariableW(key, NULL);
2715 if (!wcscmp(buf, L"off")) {
2716 close(fd);
2717 handle = GetStdHandle(std_id);
2718 if (handle != INVALID_HANDLE_VALUE)
2719 CloseHandle(handle);
2720 return;
2721 }
2722 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2723 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2724 if (handle == INVALID_HANDLE_VALUE) {
2725 close(fd);
2726 handle = GetStdHandle(std_id);
2727 if (handle != INVALID_HANDLE_VALUE)
2728 CloseHandle(handle);
2729 } else {
2730 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2731 SetStdHandle(std_id, handle);
2732 dup2(new_fd, fd);
2733 /* do *not* close the new_fd: that would close stdout */
2734 }
2735 return;
2736 }
2737 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2738 flags, NULL);
2739 if (handle != INVALID_HANDLE_VALUE) {
2740 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2741 SetStdHandle(std_id, handle);
2742 dup2(new_fd, fd);
2743 close(new_fd);
2744 }
2745 }
2746
2747 static void maybe_redirect_std_handles(void)
2748 {
2749 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2750 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2751 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2752 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2753 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2754 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2755 }
2756
2757 #ifdef _MSC_VER
2758 #ifdef _DEBUG
2759 #include <crtdbg.h>
2760 #endif
2761 #endif
2762
2763 /*
2764 * We implement wmain() and compile with -municode, which would
2765 * normally ignore main(), but we call the latter from the former
2766 * so that we can handle non-ASCII command-line parameters
2767 * appropriately.
2768 *
2769 * To be more compatible with the core git code, we convert
2770 * argv into UTF8 and pass them directly to main().
2771 */
2772 int wmain(int argc, const wchar_t **wargv)
2773 {
2774 int i, maxlen, exit_status;
2775 char *buffer, **save;
2776 const char **argv;
2777
2778 trace2_initialize_clock();
2779
2780 #ifdef _MSC_VER
2781 #ifdef _DEBUG
2782 _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
2783 #endif
2784
2785 #ifdef USE_MSVC_CRTDBG
2786 _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
2787 #endif
2788 #endif
2789
2790 maybe_redirect_std_handles();
2791
2792 /* determine size of argv and environ conversion buffer */
2793 maxlen = wcslen(wargv[0]);
2794 for (i = 1; i < argc; i++)
2795 maxlen = max(maxlen, wcslen(wargv[i]));
2796
2797 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2798 maxlen = 3 * maxlen + 1;
2799 buffer = malloc_startup(maxlen);
2800
2801 /*
2802 * Create a UTF-8 version of w_argv. Also create a "save" copy
2803 * to remember all the string pointers because parse_options()
2804 * will remove claimed items from the argv that we pass down.
2805 */
2806 ALLOC_ARRAY(argv, argc + 1);
2807 ALLOC_ARRAY(save, argc + 1);
2808 for (i = 0; i < argc; i++)
2809 argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2810 argv[i] = save[i] = NULL;
2811 free(buffer);
2812
2813 /* fix Windows specific environment settings */
2814 setup_windows_environment();
2815
2816 unset_environment_variables = xstrdup("PERL5LIB");
2817
2818 /* initialize critical section for waitpid pinfo_t list */
2819 InitializeCriticalSection(&pinfo_cs);
2820
2821 /* set up default file mode and file modes for stdin/out/err */
2822 _fmode = _O_BINARY;
2823 _setmode(_fileno(stdin), _O_BINARY);
2824 _setmode(_fileno(stdout), _O_BINARY);
2825 _setmode(_fileno(stderr), _O_BINARY);
2826
2827 /* initialize Unicode console */
2828 winansi_init();
2829
2830 /* invoke the real main() using our utf8 version of argv. */
2831 exit_status = main(argc, argv);
2832
2833 for (i = 0; i < argc; i++)
2834 free(save[i]);
2835 free(save);
2836 free(argv);
2837
2838 return exit_status;
2839 }
2840
2841 int uname(struct utsname *buf)
2842 {
2843 unsigned v = (unsigned)GetVersion();
2844 memset(buf, 0, sizeof(*buf));
2845 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2846 xsnprintf(buf->release, sizeof(buf->release),
2847 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2848 /* assuming NT variants only.. */
2849 xsnprintf(buf->version, sizeof(buf->version),
2850 "%u", (v >> 16) & 0x7fff);
2851 return 0;
2852 }
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